<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>语法规范</title>
    <style>
        /* xxxxx */
        h1 {
            color: blue;font-size: 40px;
        }
    </style>
</head>
<body>
    <h1>欢迎学习前端</h1>

</body>
</html>